Abstract：
:The Southern Ocean houses a diverse and productive community of organisms. Unicellular eukaryotic diatoms are the main primary producers in this environment, where photosynthesis is limited by low concentrations of dissolved iron and large seasonal fluctuations in light, temperature and the extent of sea ice. How diatoms have adapted to this extreme environment is largely unknown. Here we present insights into the genome evolution of a cold-adapted diatom from the Southern Ocean, Fragilariopsis cylindrus, based on a comparison with temperate diatoms. We find that approximately 24.7 per cent of the diploid F. cylindrus genome consists of genetic loci with alleles that are highly divergent (15.1 megabases of the total genome size of 61.1 megabases). These divergent alleles were differentially expressed across environmental conditions, including darkness, low iron, freezing, elevated temperature and increased CO2. Alleles with the largest ratio of non-synonymous to synonymous nucleotide substitutions also show the most pronounced condition-dependent expression, suggesting a correlation between diversifying selection and allelic differentiation. Divergent alleles may be involved in adaptation to environmental fluctuations in the Southern Ocean.
journal_name
Naturejournal_title
Natureauthors
Mock T,Otillar RP,Strauss J,McMullan M,Paajanen P,Schmutz J,Salamov A,Sanges R,Toseland A,Ward BJ,Allen AE,Dupont CL,Frickenhaus S,Maumus F,Veluchamy A,Wu T,Barry KW,Falciatore A,Ferrante MI,Fortunato AE,Glöcknerdoi
10.1038/nature20803subject
Has Abstractpub_date
2017-01-26 00:00:00pages
536-540issue
7638eissn
0028-0836issn
1476-4687pii
nature20803journal_volume
541pub_type
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